1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * acerhdf - A driver which monitors the temperature
4 * of the aspire one netbook, turns on/off the fan
5 * as soon as the upper/lower threshold is reached.
6 *
7 * (C) 2009 - Peter Kaestle peter (a) piie.net
8 * https://piie.net
9 * 2009 Borislav Petkov bp (a) alien8.de
10 *
11 * Inspired by and many thanks to:
12 * o acerfand - Rachel Greenham
13 * o acer_ec.pl - Michael Kurz michi.kurz (at) googlemail.com
14 * - Petr Tomasek tomasek (#) etf,cuni,cz
15 * - Carlos Corbacho cathectic (at) gmail.com
16 * o lkml - Matthew Garrett
17 * - Borislav Petkov
18 * - Andreas Mohr
19 */
20
21 #define pr_fmt(fmt) "acerhdf: " fmt
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/dmi.h>
26 #include <linux/acpi.h>
27 #include <linux/thermal.h>
28 #include <linux/platform_device.h>
29
30 /*
31 * The driver is started with "kernel mode off" by default. That means, the BIOS
32 * is still in control of the fan. In this mode the driver allows to read the
33 * temperature of the cpu and a userspace tool may take over control of the fan.
34 * If the driver is switched to "kernel mode" (e.g. via module parameter) the
35 * driver is in full control of the fan. If you want the module to be started in
36 * kernel mode by default, define the following:
37 */
38 #undef START_IN_KERNEL_MODE
39
40 #define DRV_VER "0.7.0"
41
42 /*
43 * According to the Atom N270 datasheet,
44 * (http://download.intel.com/design/processor/datashts/320032.pdf) the
45 * CPU's optimal operating limits denoted in junction temperature as
46 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
47 * assume 89°C is critical temperature.
48 */
49 #define ACERHDF_TEMP_CRIT 89000
50 #define ACERHDF_FAN_OFF 0
51 #define ACERHDF_FAN_AUTO 1
52
53 /*
54 * No matter what value the user puts into the fanon variable, turn on the fan
55 * at 80 degree Celsius to prevent hardware damage
56 */
57 #define ACERHDF_MAX_FANON 80000
58
59 /*
60 * Maximum interval between two temperature checks is 15 seconds, as the die
61 * can get hot really fast under heavy load (plus we shouldn't forget about
62 * possible impact of _external_ aggressive sources such as heaters, sun etc.)
63 */
64 #define ACERHDF_MAX_INTERVAL 15
65
66 #ifdef START_IN_KERNEL_MODE
67 static int kernelmode = 1;
68 #else
69 static int kernelmode;
70 #endif
71
72 static unsigned int interval = 10;
73 static unsigned int fanon = 60000;
74 static unsigned int fanoff = 53000;
75 static unsigned int verbose;
76 static unsigned int list_supported;
77 static unsigned int fanstate = ACERHDF_FAN_AUTO;
78 static char force_bios[16];
79 static char force_product[16];
80 static unsigned int prev_interval;
81 static struct thermal_zone_device *thz_dev;
82 static struct thermal_cooling_device *cl_dev;
83 static struct platform_device *acerhdf_dev;
84
85 module_param(kernelmode, uint, 0);
86 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
87 module_param(fanon, uint, 0600);
88 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
89 module_param(fanoff, uint, 0600);
90 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
91 module_param(verbose, uint, 0600);
92 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
93 module_param(list_supported, uint, 0600);
94 MODULE_PARM_DESC(list_supported, "List supported models and BIOS versions");
95 module_param_string(force_bios, force_bios, 16, 0);
96 MODULE_PARM_DESC(force_bios, "Pretend system has this known supported BIOS version");
97 module_param_string(force_product, force_product, 16, 0);
98 MODULE_PARM_DESC(force_product, "Pretend system is this known supported model");
99
100 /*
101 * cmd_off: to switch the fan completely off and check if the fan is off
102 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
103 * the fan speed depending on the temperature
104 */
105 struct fancmd {
106 u8 cmd_off;
107 u8 cmd_auto;
108 };
109
110 struct manualcmd {
111 u8 mreg;
112 u8 moff;
113 };
114
115 /* default register and command to disable fan in manual mode */
116 static const struct manualcmd mcmd = {
117 .mreg = 0x94,
118 .moff = 0xff,
119 };
120
121 /* BIOS settings - only used during probe */
122 struct bios_settings {
123 const char *vendor;
124 const char *product;
125 const char *version;
126 u8 fanreg;
127 u8 tempreg;
128 struct fancmd cmd;
129 int mcmd_enable;
130 };
131
132 /* This could be a daughter struct in the above, but not worth the redirect */
133 struct ctrl_settings {
134 u8 fanreg;
135 u8 tempreg;
136 struct fancmd cmd;
137 int mcmd_enable;
138 };
139
140 static struct ctrl_settings ctrl_cfg __read_mostly;
141
142 /* Register addresses and values for different BIOS versions */
143 static const struct bios_settings bios_tbl[] __initconst = {
144 /* AOA110 */
145 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
146 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
147 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
148 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
149 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
150 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
151 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
152 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
153 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
154 /* AOA150 */
155 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
156 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
157 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
158 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
159 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
160 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
161 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
162 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
163 /* LT1005u */
164 {"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
165 /* Acer 1410 */
166 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
167 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
168 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
169 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
170 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
171 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
172 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
173 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
174 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
175 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
176 {"Acer", "Aspire 1410", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
177 /* Acer 1810xx */
178 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
179 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
180 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
181 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
182 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
183 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
184 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
185 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
186 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
187 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
188 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
189 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
190 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
191 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
192 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
193 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
194 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
195 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
196 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
197 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00}, 0},
198 {"Acer", "Aspire 1810TZ", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
199 {"Acer", "Aspire 1810T", "v1.3314", 0x55, 0x58, {0x9e, 0x00}, 0},
200 /* Acer 5755G */
201 {"Acer", "Aspire 5755G", "V1.20", 0xab, 0xb4, {0x00, 0x08}, 0},
202 {"Acer", "Aspire 5755G", "V1.21", 0xab, 0xb3, {0x00, 0x08}, 0},
203 /* Acer 521 */
204 {"Acer", "AO521", "V1.11", 0x55, 0x58, {0x1f, 0x00}, 0},
205 /* Acer 531 */
206 {"Acer", "AO531h", "v0.3104", 0x55, 0x58, {0x20, 0x00}, 0},
207 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00}, 0},
208 {"Acer", "AO531h", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
209 /* Acer 751 */
210 {"Acer", "AO751h", "V0.3206", 0x55, 0x58, {0x21, 0x00}, 0},
211 {"Acer", "AO751h", "V0.3212", 0x55, 0x58, {0x21, 0x00}, 0},
212 /* Acer 753 */
213 {"Acer", "Aspire One 753", "V1.24", 0x93, 0xac, {0x14, 0x04}, 1},
214 /* Acer 1825 */
215 {"Acer", "Aspire 1825PTZ", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
216 {"Acer", "Aspire 1825PTZ", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
217 /* Acer Extensa 5420 */
218 {"Acer", "Extensa 5420", "V1.17", 0x93, 0xac, {0x14, 0x04}, 1},
219 /* Acer Aspire 5315 */
220 {"Acer", "Aspire 5315", "V1.19", 0x93, 0xac, {0x14, 0x04}, 1},
221 /* Acer Aspire 5739 */
222 {"Acer", "Aspire 5739G", "V1.3311", 0x55, 0x58, {0x20, 0x00}, 0},
223 /* Acer TravelMate 7730 */
224 {"Acer", "TravelMate 7730G", "v0.3509", 0x55, 0x58, {0xaf, 0x00}, 0},
225 /* Acer Aspire 7551 */
226 {"Acer", "Aspire 7551", "V1.18", 0x93, 0xa8, {0x14, 0x04}, 1},
227 /* Acer TravelMate TM8573T */
228 {"Acer", "TM8573T", "V1.13", 0x93, 0xa8, {0x14, 0x04}, 1},
229 /* Gateway */
230 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00}, 0},
231 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00}, 0},
232 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00}, 0},
233 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
234 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
235 {"Gateway", "LT31", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
236 {"Gateway", "LT31", "v1.3307", 0x55, 0x58, {0x9e, 0x00}, 0},
237 /* Packard Bell */
238 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00}, 0},
239 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
240 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00}, 0},
241 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00}, 0},
242 {"Packard Bell", "ENBFT", "V1.3118", 0x55, 0x58, {0x9e, 0x00}, 0},
243 {"Packard Bell", "ENBFT", "V1.3127", 0x55, 0x58, {0x9e, 0x00}, 0},
244 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00}, 0},
245 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00}, 0},
246 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00}, 0},
247 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00}, 0},
248 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00}, 0},
249 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00}, 0},
250 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00}, 0},
251 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00}, 0},
252 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00}, 0},
253 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00}, 0},
254 {"Packard Bell", "DOTMA", "v1.3303t", 0x55, 0x58, {0x9e, 0x00}, 0},
255 {"Packard Bell", "DOTVR46", "v1.3308", 0x55, 0x58, {0x9e, 0x00}, 0},
256 /* pewpew-terminator */
257 {"", "", "", 0, 0, {0, 0}, 0}
258 };
259
260 /*
261 * this struct is used to instruct thermal layer to use bang_bang instead of
262 * default governor for acerhdf
263 */
264 static struct thermal_zone_params acerhdf_zone_params = {
265 .governor_name = "bang_bang",
266 };
267
acerhdf_get_temp(int * temp)268 static int acerhdf_get_temp(int *temp)
269 {
270 u8 read_temp;
271
272 if (ec_read(ctrl_cfg.tempreg, &read_temp))
273 return -EINVAL;
274
275 *temp = read_temp * 1000;
276
277 return 0;
278 }
279
acerhdf_get_fanstate(int * state)280 static int acerhdf_get_fanstate(int *state)
281 {
282 u8 fan;
283
284 if (ec_read(ctrl_cfg.fanreg, &fan))
285 return -EINVAL;
286
287 if (fan != ctrl_cfg.cmd.cmd_off)
288 *state = ACERHDF_FAN_AUTO;
289 else
290 *state = ACERHDF_FAN_OFF;
291
292 return 0;
293 }
294
acerhdf_change_fanstate(int state)295 static void acerhdf_change_fanstate(int state)
296 {
297 unsigned char cmd;
298
299 if (verbose)
300 pr_notice("fan %s\n", state == ACERHDF_FAN_OFF ? "OFF" : "ON");
301
302 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) {
303 pr_err("invalid fan state %d requested, setting to auto!\n",
304 state);
305 state = ACERHDF_FAN_AUTO;
306 }
307
308 cmd = (state == ACERHDF_FAN_OFF) ? ctrl_cfg.cmd.cmd_off
309 : ctrl_cfg.cmd.cmd_auto;
310 fanstate = state;
311
312 ec_write(ctrl_cfg.fanreg, cmd);
313
314 if (ctrl_cfg.mcmd_enable && state == ACERHDF_FAN_OFF) {
315 if (verbose)
316 pr_notice("turning off fan manually\n");
317 ec_write(mcmd.mreg, mcmd.moff);
318 }
319 }
320
acerhdf_check_param(struct thermal_zone_device * thermal)321 static void acerhdf_check_param(struct thermal_zone_device *thermal)
322 {
323 if (fanon > ACERHDF_MAX_FANON) {
324 pr_err("fanon temperature too high, set to %d\n",
325 ACERHDF_MAX_FANON);
326 fanon = ACERHDF_MAX_FANON;
327 }
328
329 if (kernelmode && prev_interval != interval) {
330 if (interval > ACERHDF_MAX_INTERVAL) {
331 pr_err("interval too high, set to %d\n",
332 ACERHDF_MAX_INTERVAL);
333 interval = ACERHDF_MAX_INTERVAL;
334 }
335 if (verbose)
336 pr_notice("interval changed to: %d\n", interval);
337
338 if (thermal)
339 thermal->polling_delay_jiffies =
340 round_jiffies(msecs_to_jiffies(interval * 1000));
341
342 prev_interval = interval;
343 }
344 }
345
346 /*
347 * This is the thermal zone callback which does the delayed polling of the fan
348 * state. We do check /sysfs-originating settings here in acerhdf_check_param()
349 * as late as the polling interval is since we can't do that in the respective
350 * accessors of the module parameters.
351 */
acerhdf_get_ec_temp(struct thermal_zone_device * thermal,int * t)352 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
353 {
354 int temp, err = 0;
355
356 err = acerhdf_get_temp(&temp);
357 if (err)
358 return err;
359
360 if (verbose)
361 pr_notice("temp %d\n", temp);
362
363 *t = temp;
364 return 0;
365 }
366
acerhdf_bind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)367 static int acerhdf_bind(struct thermal_zone_device *thermal,
368 struct thermal_cooling_device *cdev)
369 {
370 /* if the cooling device is the one from acerhdf bind it */
371 if (cdev != cl_dev)
372 return 0;
373
374 if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
375 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
376 THERMAL_WEIGHT_DEFAULT)) {
377 pr_err("error binding cooling dev\n");
378 return -EINVAL;
379 }
380 return 0;
381 }
382
acerhdf_unbind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)383 static int acerhdf_unbind(struct thermal_zone_device *thermal,
384 struct thermal_cooling_device *cdev)
385 {
386 if (cdev != cl_dev)
387 return 0;
388
389 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
390 pr_err("error unbinding cooling dev\n");
391 return -EINVAL;
392 }
393 return 0;
394 }
395
acerhdf_revert_to_bios_mode(void)396 static inline void acerhdf_revert_to_bios_mode(void)
397 {
398 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
399 kernelmode = 0;
400
401 pr_notice("kernel mode fan control OFF\n");
402 }
acerhdf_enable_kernelmode(void)403 static inline void acerhdf_enable_kernelmode(void)
404 {
405 kernelmode = 1;
406
407 pr_notice("kernel mode fan control ON\n");
408 }
409
410 /*
411 * set operation mode;
412 * enabled: the thermal layer of the kernel takes care about
413 * the temperature and the fan.
414 * disabled: the BIOS takes control of the fan.
415 */
acerhdf_change_mode(struct thermal_zone_device * thermal,enum thermal_device_mode mode)416 static int acerhdf_change_mode(struct thermal_zone_device *thermal,
417 enum thermal_device_mode mode)
418 {
419 if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
420 acerhdf_revert_to_bios_mode();
421 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
422 acerhdf_enable_kernelmode();
423
424 return 0;
425 }
426
acerhdf_get_trip_type(struct thermal_zone_device * thermal,int trip,enum thermal_trip_type * type)427 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
428 enum thermal_trip_type *type)
429 {
430 if (trip == 0)
431 *type = THERMAL_TRIP_ACTIVE;
432 else if (trip == 1)
433 *type = THERMAL_TRIP_CRITICAL;
434 else
435 return -EINVAL;
436
437 return 0;
438 }
439
acerhdf_get_trip_hyst(struct thermal_zone_device * thermal,int trip,int * temp)440 static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
441 int *temp)
442 {
443 if (trip != 0)
444 return -EINVAL;
445
446 *temp = fanon - fanoff;
447
448 return 0;
449 }
450
acerhdf_get_trip_temp(struct thermal_zone_device * thermal,int trip,int * temp)451 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
452 int *temp)
453 {
454 if (trip == 0)
455 *temp = fanon;
456 else if (trip == 1)
457 *temp = ACERHDF_TEMP_CRIT;
458 else
459 return -EINVAL;
460
461 return 0;
462 }
463
acerhdf_get_crit_temp(struct thermal_zone_device * thermal,int * temperature)464 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal,
465 int *temperature)
466 {
467 *temperature = ACERHDF_TEMP_CRIT;
468 return 0;
469 }
470
471 /* bind callback functions to thermalzone */
472 static struct thermal_zone_device_ops acerhdf_dev_ops = {
473 .bind = acerhdf_bind,
474 .unbind = acerhdf_unbind,
475 .get_temp = acerhdf_get_ec_temp,
476 .change_mode = acerhdf_change_mode,
477 .get_trip_type = acerhdf_get_trip_type,
478 .get_trip_hyst = acerhdf_get_trip_hyst,
479 .get_trip_temp = acerhdf_get_trip_temp,
480 .get_crit_temp = acerhdf_get_crit_temp,
481 };
482
483
484 /*
485 * cooling device callback functions
486 * get maximal fan cooling state
487 */
acerhdf_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)488 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
489 unsigned long *state)
490 {
491 *state = 1;
492
493 return 0;
494 }
495
acerhdf_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)496 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev,
497 unsigned long *state)
498 {
499 int err = 0, tmp;
500
501 err = acerhdf_get_fanstate(&tmp);
502 if (err)
503 return err;
504
505 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0;
506 return 0;
507 }
508
509 /* change current fan state - is overwritten when running in kernel mode */
acerhdf_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)510 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
511 unsigned long state)
512 {
513 int cur_temp, cur_state, err = 0;
514
515 if (!kernelmode)
516 return 0;
517
518 err = acerhdf_get_temp(&cur_temp);
519 if (err) {
520 pr_err("error reading temperature, hand off control to BIOS\n");
521 goto err_out;
522 }
523
524 err = acerhdf_get_fanstate(&cur_state);
525 if (err) {
526 pr_err("error reading fan state, hand off control to BIOS\n");
527 goto err_out;
528 }
529
530 if (state == 0) {
531 if (cur_state == ACERHDF_FAN_AUTO)
532 acerhdf_change_fanstate(ACERHDF_FAN_OFF);
533 } else {
534 if (cur_state == ACERHDF_FAN_OFF)
535 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
536 }
537 return 0;
538
539 err_out:
540 acerhdf_revert_to_bios_mode();
541 return -EINVAL;
542 }
543
544 /* bind fan callbacks to fan device */
545 static const struct thermal_cooling_device_ops acerhdf_cooling_ops = {
546 .get_max_state = acerhdf_get_max_state,
547 .get_cur_state = acerhdf_get_cur_state,
548 .set_cur_state = acerhdf_set_cur_state,
549 };
550
551 /* suspend / resume functionality */
acerhdf_suspend(struct device * dev)552 static int acerhdf_suspend(struct device *dev)
553 {
554 if (kernelmode)
555 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
556
557 if (verbose)
558 pr_notice("going suspend\n");
559
560 return 0;
561 }
562
acerhdf_probe(struct platform_device * device)563 static int acerhdf_probe(struct platform_device *device)
564 {
565 return 0;
566 }
567
acerhdf_remove(struct platform_device * device)568 static int acerhdf_remove(struct platform_device *device)
569 {
570 return 0;
571 }
572
573 static const struct dev_pm_ops acerhdf_pm_ops = {
574 .suspend = acerhdf_suspend,
575 .freeze = acerhdf_suspend,
576 };
577
578 static struct platform_driver acerhdf_driver = {
579 .driver = {
580 .name = "acerhdf",
581 .pm = &acerhdf_pm_ops,
582 },
583 .probe = acerhdf_probe,
584 .remove = acerhdf_remove,
585 };
586
587 /* checks if str begins with start */
str_starts_with(const char * str,const char * start)588 static int str_starts_with(const char *str, const char *start)
589 {
590 unsigned long str_len = 0, start_len = 0;
591
592 str_len = strlen(str);
593 start_len = strlen(start);
594
595 if (str_len >= start_len &&
596 !strncmp(str, start, start_len))
597 return 1;
598
599 return 0;
600 }
601
602 /* check hardware */
acerhdf_check_hardware(void)603 static int __init acerhdf_check_hardware(void)
604 {
605 char const *vendor, *version, *product;
606 const struct bios_settings *bt = NULL;
607 int found = 0;
608
609 /* get BIOS data */
610 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
611 version = dmi_get_system_info(DMI_BIOS_VERSION);
612 product = dmi_get_system_info(DMI_PRODUCT_NAME);
613
614 if (!vendor || !version || !product) {
615 pr_err("error getting hardware information\n");
616 return -EINVAL;
617 }
618
619 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
620
621 if (list_supported) {
622 pr_info("List of supported Manufacturer/Model/BIOS:\n");
623 pr_info("---------------------------------------------------\n");
624 for (bt = bios_tbl; bt->vendor[0]; bt++) {
625 pr_info("%-13s | %-17s | %-10s\n", bt->vendor,
626 bt->product, bt->version);
627 }
628 pr_info("---------------------------------------------------\n");
629 return -ECANCELED;
630 }
631
632 if (force_bios[0]) {
633 version = force_bios;
634 pr_info("forcing BIOS version: %s\n", version);
635 kernelmode = 0;
636 }
637
638 if (force_product[0]) {
639 product = force_product;
640 pr_info("forcing BIOS product: %s\n", product);
641 kernelmode = 0;
642 }
643
644 if (verbose)
645 pr_info("BIOS info: %s %s, product: %s\n",
646 vendor, version, product);
647
648 /* search BIOS version and vendor in BIOS settings table */
649 for (bt = bios_tbl; bt->vendor[0]; bt++) {
650 /*
651 * check if actual hardware BIOS vendor, product and version
652 * IDs start with the strings of BIOS table entry
653 */
654 if (str_starts_with(vendor, bt->vendor) &&
655 str_starts_with(product, bt->product) &&
656 str_starts_with(version, bt->version)) {
657 found = 1;
658 break;
659 }
660 }
661
662 if (!found) {
663 pr_err("unknown (unsupported) BIOS version %s/%s/%s, please report, aborting!\n",
664 vendor, product, version);
665 return -EINVAL;
666 }
667
668 /* Copy control settings from BIOS table before we free it. */
669 ctrl_cfg.fanreg = bt->fanreg;
670 ctrl_cfg.tempreg = bt->tempreg;
671 memcpy(&ctrl_cfg.cmd, &bt->cmd, sizeof(struct fancmd));
672 ctrl_cfg.mcmd_enable = bt->mcmd_enable;
673
674 /*
675 * if started with kernel mode off, prevent the kernel from switching
676 * off the fan
677 */
678 if (!kernelmode) {
679 pr_notice("Fan control off, to enable do:\n");
680 pr_notice("echo -n \"enabled\" > /sys/class/thermal/thermal_zoneN/mode # N=0,1,2...\n");
681 }
682
683 return 0;
684 }
685
acerhdf_register_platform(void)686 static int __init acerhdf_register_platform(void)
687 {
688 int err = 0;
689
690 err = platform_driver_register(&acerhdf_driver);
691 if (err)
692 return err;
693
694 acerhdf_dev = platform_device_alloc("acerhdf", -1);
695 if (!acerhdf_dev) {
696 err = -ENOMEM;
697 goto err_device_alloc;
698 }
699 err = platform_device_add(acerhdf_dev);
700 if (err)
701 goto err_device_add;
702
703 return 0;
704
705 err_device_add:
706 platform_device_put(acerhdf_dev);
707 err_device_alloc:
708 platform_driver_unregister(&acerhdf_driver);
709 return err;
710 }
711
acerhdf_unregister_platform(void)712 static void acerhdf_unregister_platform(void)
713 {
714 platform_device_unregister(acerhdf_dev);
715 platform_driver_unregister(&acerhdf_driver);
716 }
717
acerhdf_register_thermal(void)718 static int __init acerhdf_register_thermal(void)
719 {
720 int ret;
721
722 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
723 &acerhdf_cooling_ops);
724
725 if (IS_ERR(cl_dev))
726 return -EINVAL;
727
728 thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
729 &acerhdf_dev_ops,
730 &acerhdf_zone_params, 0,
731 (kernelmode) ? interval*1000 : 0);
732 if (IS_ERR(thz_dev))
733 return -EINVAL;
734
735 if (kernelmode)
736 ret = thermal_zone_device_enable(thz_dev);
737 else
738 ret = thermal_zone_device_disable(thz_dev);
739 if (ret)
740 return ret;
741
742 if (strcmp(thz_dev->governor->name,
743 acerhdf_zone_params.governor_name)) {
744 pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
745 acerhdf_zone_params.governor_name);
746 return -EINVAL;
747 }
748
749 return 0;
750 }
751
acerhdf_unregister_thermal(void)752 static void acerhdf_unregister_thermal(void)
753 {
754 if (cl_dev) {
755 thermal_cooling_device_unregister(cl_dev);
756 cl_dev = NULL;
757 }
758
759 if (thz_dev) {
760 thermal_zone_device_unregister(thz_dev);
761 thz_dev = NULL;
762 }
763 }
764
acerhdf_init(void)765 static int __init acerhdf_init(void)
766 {
767 int err = 0;
768
769 err = acerhdf_check_hardware();
770 if (err)
771 goto out_err;
772
773 err = acerhdf_register_platform();
774 if (err)
775 goto out_err;
776
777 err = acerhdf_register_thermal();
778 if (err)
779 goto err_unreg;
780
781 return 0;
782
783 err_unreg:
784 acerhdf_unregister_thermal();
785 acerhdf_unregister_platform();
786
787 out_err:
788 return err;
789 }
790
acerhdf_exit(void)791 static void __exit acerhdf_exit(void)
792 {
793 acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
794 acerhdf_unregister_thermal();
795 acerhdf_unregister_platform();
796 }
797
798 MODULE_LICENSE("GPL");
799 MODULE_AUTHOR("Peter Kaestle");
800 MODULE_DESCRIPTION("Aspire One temperature and fan driver");
801 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:");
802 MODULE_ALIAS("dmi:*:*Acer*:pnAO751h*:");
803 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1410*:");
804 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1810*:");
805 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5755G:");
806 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*1825PTZ:");
807 MODULE_ALIAS("dmi:*:*Acer*:pnAO521*:");
808 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:");
809 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5739G:");
810 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*One*753:");
811 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*5315:");
812 MODULE_ALIAS("dmi:*:*Acer*:TravelMate*7730G:");
813 MODULE_ALIAS("dmi:*:*Acer*:pnAspire*7551:");
814 MODULE_ALIAS("dmi:*:*Acer*:TM8573T:");
815 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:");
816 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:");
817 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnAOA*:");
818 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOA*:");
819 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMU*:");
820 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnENBFT*:");
821 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTMA*:");
822 MODULE_ALIAS("dmi:*:*Packard*Bell*:pnDOTVR46*:");
823 MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:");
824
825 module_init(acerhdf_init);
826 module_exit(acerhdf_exit);
827
interval_set_uint(const char * val,const struct kernel_param * kp)828 static int interval_set_uint(const char *val, const struct kernel_param *kp)
829 {
830 int ret;
831
832 ret = param_set_uint(val, kp);
833 if (ret)
834 return ret;
835
836 acerhdf_check_param(thz_dev);
837
838 return 0;
839 }
840
841 static const struct kernel_param_ops interval_ops = {
842 .set = interval_set_uint,
843 .get = param_get_uint,
844 };
845
846 module_param_cb(interval, &interval_ops, &interval, 0600);
847 MODULE_PARM_DESC(interval, "Polling interval of temperature check");
848